救援人员终于移走了坍塌的基桥的最后一个大型钢桁架，这座桥阻塞了巴尔的摩700英尺宽的麦克亨利堡联邦通道。

2024年6月3日至4日，被称为“4C段”的坍塌的弗朗西斯·斯科特基桥的最后部分被小心翼翼地移走。

救援人员使用混凝土***、氧乙炔炬和水下测量，从水下桁架段小心翼翼地提取了数吨混凝土道路、电缆和钢筋。

为了确保航道的完整性，用抓斗挖泥船精心清除了残骸。

陆军工程兵团称这次行动“范围广泛”，面临各种挑战。

大桥的部分路段严重卡在河泥线上，需要付出额外的努力才能将其拆除。

这一过程需要严格的“摇晃和锤击”才能将钢材从泥泞的外壳中取出。

陆军发言人强调了这一成就的重要性，他表示，最后的桁架吊装是重新开放联邦航道的关键一步。

随着最后的碎片被清除，现在的重点是作业的最后阶段，包括疏浚和对通道的全面评估，以确保其安全。

尽管没有给出正式日期，但有报道称，收尾工作将于2024年6月8日至10日完成。

联邦海峡已经部分清理完毕，允许在400英尺宽、50英尺深的区域有限通行。

然而，完成打捞活动将恢复完整的航行能力，允许深吃水商船进入巴尔的摩港。

2024年3月26日，弗朗西斯·斯科特·基桥(Francis Scott Key Bridge)倒塌，造成6名建筑工人死亡，这促使人们在恢复过程中表现出非凡的韧性和决心。

巴尔的摩官员对这一快速进展表示赞赏，并补充说，这项工作将在事故发生后约80天内完成。

马里兰州交通管理局已经通过征求建议书启动了替代计划。

提交截止日期为2024年6月24日，并计划在今年夏天选择承包商。

最终设计预计将在接下来的一年内选出。

这座新桥将耗资17亿美元，计划于2028年秋季完工。

随着打捞人员完成他们的工作，航道准备重新开放，人们的注意力转向重建和维护巴尔的摩关键基础设施的安全性和弹性。

▲Image Credits: USACE Baltimore/Twitter

英文原文

Salvage crews have finally removed the final large steel truss of the collapsed Key Bridge, blocking the 700-foot-wide Fort McHenry Federal Channel in Baltimore.

The final pieces of the collapsed Francis Scott Key Bridge, known as “Section 4C”, were carefully removed on June 3-4, 2024.

The salvage crews carefully extracted tons of concrete roads, cable, and steel rebar from the submerged truss segment using concrete breakers, oxyacetylene torches, and underwater surveys.

Debris was meticulously removed with clamshell dredges to ensure the channel’s integrity.

The Army Corps of Engineers described the operation as “extensive”, presenting various challenges.

Sections of the bridge were severely lodged in the river mudline, necessitating extra effort to remove them.

The procedure required rigorous “shaking and hammering” to remove the steel from its muddy encasement.

The Army Corps spokesperson emphasised the significance of the accomplishment by stating that the final truss lifting is a crucial step toward reopening the federal navigation channel.

With the final debris removed, the focus is now on the final phase of the operation, which involves dredging and a thorough evaluation of the channel to ensure its safety.

Although no official date has been given, reports indicate that the finishing works will be completed between June 8 to 10, 2024.

The Federal Channel had already been partially cleared, allowing limited access over its 400-foot width and 50-foot depth.

However, completing the salvage activities will restore complete navigation capabilities, allowing deep-draft commercial vessels to access the Port of Baltimore.

The collapse of the Francis Scott Key Bridge on March 26, 2024, which killed six construction workers, prompted a remarkable display of resilience and determination in the recovery process.

Baltimore officials commended the rapid progress, adding that the work would be completed in about 80 days following the accident.

Maryland’s Transportation Authority has launched replacement plans by requesting proposals.

The submission deadline is June 24, 2024, with plans to select a contractor this summer.

The final design is expected to be selected within the following year.

The new bridge, which will cost $1.7 billion, is scheduled for completion in the fall of 2028.

As salvage personnel complete their work and the channel prepares to reopen, the attention switches to rebuilding and maintaining the safety and resilience of Baltimore’s critical infrastructure in the future.

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